Penn State Extension
Penn State Extension
Articles Why Doesn't My Holly Have Berries?
Silloo Kapadia
Lack of berries on holly is a common concern for home gardeners. This article identifies some of the reasons and possible solutions. More
Articles Spotted Lanternfly, Lycorma delicatula, is a new threat to Pennsylvania and the United States, and experts are still learning how to combat it. More
News The Extension office received a sample of damaged white oak leaves from the North Hills of Pittsburgh. Given the amount of rain we have had all year, anthracnose was a possible suspect. More
Workshops Bradford/Sullivan County Free Public Class for July. More
Workshops Learn about perennials you can plant in your own garden, and which plants have the highest ecological value. More
Articles Although the common name, white fringetree, alludes to a tree, it is often treated as a large shrub in the landscape, reaching a range of anywhere from 12 to 20 feet. More
News During my twenty-four year career, the most common tree problem that I encounter isn’t an insect or a disease—it is us. More
Articles Shrubs and Trees for the Winter Landscape
Pamela T. Hubbard
Look for trees and shrubs that could beautify your property and nurture wildlife during the winter months. More
Articles Stay Alert for Oak Wilt!
Sandy Feather
Oak wilt was not known in New York before 2008, but foresters and arborists are managing it there now. More
Articles The yellownecked caterpillar is a key pest of shade trees. This insect is also destructive on the foliage of blueberry, apple, and other fruit trees. More
Articles Extendiendo la Temporada Productiva con Túneles Altos
Elsa Sanchez, Ph.D.
Los túneles altos ofrecen protección a las plantas de tierras saturadas de humedad y temperaturas bajas en la primavera y el otoño con lo cual se extiende la temporada productiva. More
Articles Tree Diseases
Tim Abbey
Living in the humid mid-Atlantic area, we have lots of fungal and bacterial diseases to contend with. More
Workshops This workshop will introduce landscape professionals to common and underused native plants suitable for a variety of residential and commercial applications. More
Articles Use Glyphosate With Care Near Trees!
Sandy Feather
Glyphosate is the active ingredient in non-selective, systemic herbicides sold under a variety of trade names – Round Up, Accord, Glypro, and many others. More
Workshops Arborist Short Course
Multiple Options Available
From: $250.00
To: $275.00
Attend this four-day course to prepare for the ISA Certified Arborist exam and improve your marketability! More
Articles Four-lined Plant Bugs Are Active Now
Sandy Feather
Four-lined plant bugs, Poecilocapsus lineatus, become active in May. More
Articles Working With the Black Walnut
Kathleen V. Salisbury
Black walnut is one of the last trees to leaf out in the spring and one of the first to lose its leaves in the fall. More
Articles This free manual provides recommendations to land managers and landscape contractors on best management practices for effectively conducting organic land care. More
Articles Viburnum Leaf Beetle
Steve Jacobs
An invasive species, the viburnum leaf beetle has the potential to become a serious problem in nurseries and landscapes in Pennsylvania. More
Articles The tuliptree scale is a pest of yellow poplar, or tuliptree, magnolia, and linden. This soft scale insect is so prolific that it can cover twigs and branches. More
Articles The snailcase bagworm is a moth (family Psychidae) that was accidentally introduced into the United States from Europe in the 1940s. More
Articles Powderpost beetles breed in dead and dried hardwoods. Their presence is overlooked until they are discovered in stored lumber, rafters, joists, floors, and furniture. More
Articles The potato leafhopper has been noted on more than 200 host plants, many of which are ornamental plants. However, this insect is best known as a field crop pest. More
Articles The periodical cicada is the longest-lived insect in North America. They are distributed over the eastern United States and occur nowhere else in the world. More
Articles The pear thrips is native to Europe. Since the 1980s, the pear thrips has been recognized as a forest tree pest in Pennsylvania, particularly damaging sugar maples. More